/*
 Copyright 2014 Alexander V. Nikulin
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at
	
 	http://www.apache.org/licenses/LICENSE-2.0
	
 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
*/
package ru.avn.adf;

/**
 * @author Alexander V. Nikulin
 */
public class MethodInvokers {

	private static class NullMethodInvokerHolder {
		protected static NullMethodInvoker NULL_METHOD_INVOKER_INSTANCE = new NullMethodInvoker();
	}
	
	private static class NullMethodInvoker implements MethodInvoker {
		@Override
		public Object invoke(Object targetObject, Object... args) {
			return null;
		}
	}
	
	private static class SelfMethodInvoker implements MethodInvoker {
		
		private Object object;
				
		public SelfMethodInvoker(Object object) {
			this.object = object;
		}

		@Override
		public Object invoke(Object targetObject, Object... args) {
			return object;
		}
	
	}	

	public static MethodInvoker getNullMethodInvoker() {
		return NullMethodInvokerHolder.NULL_METHOD_INVOKER_INSTANCE;
	}
	
	public static MethodInvoker getSelfMethodInvoker(Object object) {
		return new SelfMethodInvoker(object);
	}
	
}
